[RFC PATCH 3/4] pinctrl: rockchip: split out verification of mux settings

John Keeping
2017-03-13T18:38:12Z

We need to avoid calling regmap functions from irq handlers, so the next
commit is going to move the call to rockchip_set_mux() into an
irq_bus_sync_unlock handler. But we can't return an error from there so
we still need to check the settings from rockchip_irq_set_type() and we
will use this new rockchip_verify_mux() function from there.

Signed-off-by: John Keeping <john@metanate.com>
---
drivers/pinctrl/pinctrl-rockchip.c | 46 +++++++++++++++++++++++++-------------
1 file changed, 30 insertions(+), 16 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 2f963aea64b2..52e70c4aef7c 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -629,6 +629,31 @@ static int rockchip_get_mux(struct rockchip_pin_bank *bank, int pin)
return ((val >> bit) & mask);
}

+static int rockchip_verify_mux(struct rockchip_pin_bank *bank,
+ int pin, int mux)
+{
+ struct rockchip_pinctrl *info = bank->drvdata;
+ int iomux_num = (pin / 8);
+
+ if (iomux_num > 3)
+ return -EINVAL;
+
+ if (bank->iomux[iomux_num].type & IOMUX_UNROUTED) {
+ dev_err(info->dev, "pin %d is unrouted\n", pin);
+ return -EINVAL;
+ }
+
+ if (bank->iomux[iomux_num].type & IOMUX_GPIO_ONLY) {
+ if (mux != RK_FUNC_GPIO) {
+ dev_err(info->dev,
+ "pin %d only supports a gpio mux\n", pin);
+ return -ENOTSUPP;
+ }
+ }
+
+ return 0;
+}
+
/*
* Set a new mux function for a pin.
*
@@ -652,23 +677,12 @@ static int rockchip_set_mux(struct rockchip_pin_bank *bank, int pin, int mux)
u8 bit;
u32 data, rmask;

- if (iomux_num > 3)
- return -EINVAL;
-
- if (bank->iomux[iomux_num].type & IOMUX_UNROUTED) {
- dev_err(info->dev, "pin %d is unrouted\n", pin);
- return -EINVAL;
- }
+ ret = rockchip_verify_mux(bank, pin, mux);
+ if (ret < 0)
+ return ret;

- if (bank->iomux[iomux_num].type & IOMUX_GPIO_ONLY) {
- if (mux != RK_FUNC_GPIO) {
- dev_err(info->dev,
- "pin %d only supports a gpio mux\n", pin);
- return -ENOTSUPP;
- } else {
- return 0;
- }
- }
+ if (bank->iomux[iomux_num].type & IOMUX_GPIO_ONLY)
+ return 0;

dev_dbg(info->dev, "setting mux of GPIO%d-%d to %d\n",
bank->bank_num, pin, mux);
--
2.12.0.377.gf910686b23.dirty